This is the pharmacy's fault. I work at a hospital's outpatient pharmacy and this comes up a lot. Either play it safe and have your attending write it each time, have the patient fill at your hospital's outpatient pharmacy, or include the following instructions with your CII prescriptions:
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If you get a rejection saying that prescriber DEA not associated (or valid,etc) on a Medicare D claim, verify that the DEA and NPI are correct, then use one of the following submission clarification codes in sub clar field #1:
42 - NPI is valid
43- DEA is being renewed
44 - DEA recently reactivated
45 - DEA is a valid hospital-issued number with suffix
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45 is the most appropriate one for what you're talking about. Just make sure you put your hospital's DEA including your own personal suffix on the prescription. Hope that helps.